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Java > Open Source Codes > com > caucho > jsp > java > JstlCoreRemove


1 /*
2  * Copyright (c) 1998-2006 Caucho Technology -- all rights reserved
3  *
4  * This file is part of Resin(R) Open Source
5  *
6  * Each copy or derived work must preserve the copyright notice and this
7  * notice unmodified.
8  *
9  * Resin Open Source is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License as published by
11  * the Free Software Foundation; either version 2 of the License, or
12  * (at your option) any later version.
13  *
14  * Resin Open Source is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
17  * of NON-INFRINGEMENT. See the GNU General Public License for more
18  * details.
19  *
20  * You should have received a copy of the GNU General Public License
21  * along with Resin Open Source; if not, write to the
22  * Free SoftwareFoundation, Inc.
23  * 59 Temple Place, Suite 330
24  * Boston, MA 02111-1307 USA
25  *
26  * @author Scott Ferguson
27  */
28
29 package com.caucho.jsp.java;
30
31 import com.caucho.jsp.JspParseException;
32 import com.caucho.vfs.WriteStream;
33 import com.caucho.xml.QName;
34
35 import java.io.IOException JavaDoc;
36
37 public class JstlCoreRemove extends JstlNode {
38   private static final QName VAR = new QName("var");
39   private static final QName SCOPE = new QName("scope");
40   
41   private String JavaDoc _var;
42   private String JavaDoc _scope;
43   
44   /**
45    * Adds an attribute.
46    */
47   public void addAttribute(QName name, String JavaDoc value)
48     throws JspParseException
49   {
50     if (VAR.equals(name))
51       _var = value;
52     else if (SCOPE.equals(name))
53       _scope = value;
54     else
55       throw error(L.l("`{0}' is an unknown attribute for <{1}>.",
56                       name.getName(), getTagName()));
57   }
58   /**
59    * Generates the XML text representation for the tag validation.
60    *
61    * @param os write stream to the generated XML.
62    */
63   public void printXml(WriteStream os)
64     throws IOException JavaDoc
65   {
66     os.print("<c:remove var=\"" + xmlText(_var) + "\"");
67
68     if (_scope != null)
69       os.print(" scope=\"" + xmlText(_scope) + "\"");
70
71     os.print("/>");
72   }
73
74   /**
75    * Generates the code for the c:remove tag.
76    */
77   public void generate(JspJavaWriter out)
78     throws Exception JavaDoc
79   {
80     if (_var == null)
81       throw error(L.l("required attribute `var' missing from `{0}'",
82                       getTagName()));
83
84     if (_scope == null || _scope.equals("page")) {
85       out.println("pageContext.removeAttribute(\"" + _var + "\");");
86     }
87     else if (_scope.equals("request")) {
88       out.println("pageContext.getRequest().removeAttribute(\"" + _var + "\");");
89     }
90     else if (_scope.equals("session")) {
91       out.println("pageContext.getSession().removeAttribute(\"" + _var + "\");");
92     }
93     else if (_scope.equals("application")) {
94       out.println("pageContext.getServletContext().removeAttribute(\"" + _var + "\");");
95     }
96     else
97       throw error(L.l("invalid scope `{0}'", _scope));
98   }
99 }
100
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